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Protocol Oxygen Gases are available in span ranges from 0-25%. Oxygen standards are used to calibrate Continuous Emission Monitors designed to measure O2 for compliance reporting. Applicable EPA methods: USEPA Method 3 & CFR 40 Part 60 Performance Specification 3. Please contact us for specific pricing. Protocol Carbon Dioxide Gases are available in span ranges from 0-25%. Carbon Dioxide standards are used to calibrate Continuous Emission Monitors designed to measure CO2 for compliance reporting. Applicable EPA methods: USEPA Method 3, CFR 40 Part 60 Performance Specification 3 & CFR 40 Part 75. Please contact us for specific pricing.